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Phrase(s): mad enough to chew nails (and spit rivets) [and] angry enough to chew nails; mad enough to spit nails
Inf. Fig. very angry, as if to be able to bite through metal nails. • I am mad enough to chew nails! Who took my checkbook? • Her sudden tirade made him angry enough to chew nails. • He stomped in, mad enough to chew nails and spit rivets.
McGrawhill's American Idioms And Phrasal Verbs